Search for Wolf-Rayet Stars in Local Group Giant HII Regions

Details Search for Wolf-Rayet Stars in Local Group Giant HII Regions Search for Wolf-Rayet Stars in Local Group Giant HII Regions

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2441m&link_type=abstract

HST Proposal ID #2441

Computer Science

Hst Proposal Id #2441

Scientific paper

Wolf-Rayet (WR) stars represent a common, advanced evolutionary phase for the most massive stars. Their strong and broad emission lines (caused by high mass-loss rates) make them easily detectable, even in distant and crowded regions. Because of their high massive star content, Giant HII Regions (GHR) are priviledged sites to study extreme population I stars at their birthplace. We propose to take advantage of the high resolution provided by the HST and to use PC imagery with an interference filter centered on the prominent HeII 4686 emission line to detect and locate precisely WR stars in three key GHR of the Local Group (NGC 3603, NGC 604 and NGC 595) that cannot be completely resolved from the ground. The purpose of this project is mainly twofold: to check if WR stars in GHR are normal compared to WR stars in the field and to study how population ratios (WR/O and WC/WN) can be affected by the conditions inside GHR.

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